Figure 32: Natural laughter by the voluntary contraction of the two large zygomatics and the lower palpebral orbicularis

Guillaume-Benjamin-Amand Duchenne · c. 1856, printed 1862

Figure 32: Natural laughter by the voluntary contraction of the two large zygomatics and the lower palpebral orbicularis

Albumen print from glass plate negative

Cleveland Museum of Art · CC0 1.0 · Wikidata

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